Hello have you changed on the smartphone in the app Voltage AC. If selected in the App DC can not display the correct value the Mooshimeter.

Screenshot Mooshimeter App

Thanks Ville!

EDsteve – not your fault. A user interface is like a joke: if you need to explain it, it’s not very good. A couple of people have fallen in the exact same trap as you, I’ll be looking at ways to avoid it in the future.

~James

Thank you for this thread. I came to the forum to find out why when trying to read 120VAC all I was getting was about 30VAC. I set both sample rate settings to auto and all is good (at least for that reading).

Now to demo it at work again with the right settings to try to wash the egg off my face from Friday’s failed demo of pulling it out and plugging the probes into the wall…

Thanks Harm and Sembazuru,

My plan to avoid this problem in the future is to have the app serve a warning when the settings might result in inaccurate AC settings. I don’t want to remove the user’s control of all settings, but enough people have fallen for this trap there should be a warning.

Thanks
~James

I’d rather not get constant warnings – but perhaps turn the background or text red to indicate an unusual situation? Or make the warning a once off affair?

Thanks for this post. Fixed my issue.

Hi Gordon,

The auto setting for sample rate and buffer depth should be setting it to 4000Hz and 256 samples when taking an AC reading. I’ve found these settings ideal for 50/60Hz AC signals. If you find a different strategy please let me know :)

~James

Is higher Hz and higher samples always more accurate?
Basically yes. There has been little problems with 8 kHz sampling, where you can see random spikes at random times. It might be just fine for hours or screw your whole setup. I would stay at 4 kHz and lower, if possible.

Does it shorten battery life?
I would guess that it depends on how long it takes to take those samples, so lowest Hz and highest samples would use more energy than max Hz and lowest samples. Shorter logging interval drains batteries faster, but you should get several days in any case.

After initial tests …
Which firmware/app versions do you have? There was a bug that made 10 minute intervals unusable and generated 10.176 second intervals instead. That should have been fixed a long time ago, but as most of us at this forum use beta-app, its hard to say what you really get from app/play-stores outside beta program.

https://moosh.im/wiki/index.php/Beta_Program

That firmware is quite old (I have 1522204715). Fw-updating has its problems and might took several tries, so those are not forced anymore to those of us that do not use 10 minute intervals etc.

I get that the “Hz” setting means how frequently the instantaneous DC voltage is measured so as to figure the AC characteristics.
But what does the “samples” setting mean?
It just means how many of those dc-samples are taken in one go and then analyzed. For example, you need to allow mooshimeter to see a whole sine wave to calculate its rms-value, by keeping amount of samples large enough at the sample rate you have selected. You can check what mooshimeter really sees and uses as a base for calculations, if you go to graph mode -> config -> buffer mode. It then displays your sample buffer snapshots without processing.

Hi…I had the same problem measuring 120 VAC. By adjusting both the sample rate sample count upward I was able to get a sensible reading. The AUTO settings are sketchy and give unstable results.